ROX-33443: Fix interactive legend click in Victory v37

[sachaudh]

Description

Jira: ROX-33443

Victory v37 (PF charts v8) broke getInteractiveLegendEvents -- the onLegendClick callback passed through Chart's events prop is never invoked. This PR works around the issue by attaching click events directly to the ChartLegend component.

• Apply click events directly to ChartLegend via its events prop, bypassing the broken Chart-level event propagation
• Fix chartNames ordering to match legend item indices (was using Object.values() which followed object declaration order instead of the array order used by the legend)
• Add name prop to ChartBar components so the interactive legend can target chart children for hover effects
• Unskip the component test for severity toggling and remove stale version pin comment

User-facing documentation

• CHANGELOG.md is updated OR update is not needed
• documentation PR is created and is linked above OR is not needed

Testing and quality

• the change is production ready: the change is GA, or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

• Verified severity toggling works by clicking legend items in the dashboard widget
• Ran component test: all 3 specs pass, including the previously skipped toggling test

Screenshots

Before	After

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